Re: [Xen-devel] [PATCH v2] AMD/IO-APIC: Use old IO-APIC ack method if AMD 813{1, 2} PCI-X tunnel is present

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.06.13 at 11:43, Andrew Cooper <andrew.cooper3@xxxxxxxxxx> wrote:
> On 05/06/13 09:20, Jan Beulich wrote:
>> But anyway - I continue to be unconvinced that this case can't be
>> easily enough dealt with the admin adding "ioapic_ack=old" to the
>> command line.
> 
> That describes half the errata workarounds we do.  Why does this deserve
> different treatment?.

Because (and I don't think you said anything to the contrary so far)
other than those other workarounds, this one only addresses a
portion of the effects of said erratum.

> It can certainly can be worked around by using io_apci_ack=old on the
> command line, and that is how we verified the 'fix'.  But in the
> meantime it took a normally technically-savvy customer 2 months of time
> in highest level support (i.e. my colleagues and I) before we got to the
> bottom of the issue.

I appreciate you having found the root cause.

Jan


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